Subject Line Generator
Boost your open rates with AI-powered subject lines.
Your Subject Line Is Your First Impression
47% of email recipients open an email based on the subject line alone. Our free AI tool generates catchy, high-converting subject lines to ensure your emails get opened, not ignored.
How to Write Perfect Subject Lines
Keep it Short
Mobile devices cut off subject lines after 40-60 characters. Aim for 6-8 words max to ensure visibility.
Spark Curiosity
Don’t give everything away. Use questions or teaser statements to make the recipient want to know more.
Avoid Spam Words
Words like “Free,” “Guarantee,” and “Urgent” trigger spam filters. Our tool analyzes this automatically.
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You got a great subject line? Now make sure that people can see it
Ensure your prospect will see your email in their primary inbox (not in spam or promotion tab).
Make sure to land in inbox
Your emails might not be opened if they land in the promotion tab. Use email warmup to land in the primary inbox.
Start a free trialFrequently Asked Questions
How does the Email Subject Line Generator work?
Our tool uses advanced AI to analyze the content or topic you provide. It identifies the core value proposition and rewrites it into catchy, high-converting headlines optimized for opens.
What kind of prompts should I use?
Be specific. Instead of just “Sale,” try “50% off summer collection for VIP members.” The more context you provide about your audience and offer, the better the AI can tailor the hook.
Is this tool free to use?
Yes, the Subject Line Generator is 100% free. You can generate unlimited variations, experiment with different tones, and refine your copy without any cost or subscription.
How do I know if the generated subject lines are good?
After generating options, you can use our built-in “Analyze” button or switch to our Subject Line Tester to get a score based on character count, reading grade, and spam triggers.
Can I use this tool for cold emails?
Absolutely. Select the “Curiosity” or “Professional” tone to generate subject lines specifically designed for cold outreach, which requires a different strategy than newsletters.
Does this tool use my data?
No. We do not store or share your prompts. The information you enter is processed ephemerally solely to generate your results and is discarded immediately after.